ASP使用流输出文件下载

' 下载文件
function downloadfile(fullpath)

downloadfile = false

dim strfilename, s, fso, f, intfilelength

set fso = server.createobject("scripting.filesystemobject")

if not fso.fileexists(fullpath) then
exit function
end if

set f = fso.getfile(fullpath)
'获取文件大小
intfilelength = f.size

set s = server.createobject("adodb.stream")
s.open
s.type = 1
s.loadfromfile(fullpath)

response.buffer = true
response.clear
'response.addheader "Content-Encoding","GB2312" ' 乱码的解决方案
'response.addheader "content-type","application/x-msdownload"
response.addheader "content-disposition","attachment;filename=" & f.name
response.addheader "content-length" ,intfilelength
response.contenttype = "application/octet-stream"
while not s.eos
response.binarywrite s.read(1024 * 64)
response.flush
wend
s.close
set s = nothing

downloadfile = true
end function